Sweet Temptation (2014)

Original title: 잘 먹고 잘 사는 법

Eleven-year-old boy Jeong-ho lives with his mother, whose principle of life is to eat raw food. To the boy’s seemingly bright prospect of well-being befalls a crisis: When his classmate Hye-mi teases him for his refusal of snacks, he musters up all his courage and try eating a piece of chocolate, and it is unbelievably sweet. Now Jeong-ho becomes suspicious about his lifelong lifestyle, and the suspicion grows as his body grows.